There is no social stigma to speeding, and there remain many today that claim speed limits of 80mph, 90mph, and even 100mph should be used instead of today's 65mph, 70mph, and 75mph. Most speeders today worry more about getting a ticket than the impact speeding has on accident frequency and severity.

After the repeal in 1995 of the national 65mph speed limit numerous studies were done on the impact speeding has on injury and fatality. Collectively, states that set a 75mph speed limit experienced a staggering 38% increase in deaths per million miles traveled than states that stayed at 65mph.

A 10mph increase in speed increased the death rate by 38%.

From an NCSA report:
"Speeding is one of the most prevalent factors contributing to traffic crashes. Speeding reduces a driver’s ability to steer safely around curves or objects in the roadway, extends the distance necessary to stop a vehicle, and increases the distance a vehicle travels while a driver reacts to a dangerous situation. Higher crash speeds also reduce the ability of vehicle, restraint system, and roadway hardware such as guardrails, barriers, and impact attenuators to protect vehicle occupants. Speeding is a factor in 30 percent of all fatal crashes."

This means that every driver's ability to avoid accidents is reduced, and every safety feature we build into our cars and roadways is significantly less effective as speed increases regardless of the skill of the driver, or the relative safety of the vehicle.